(X-2000)*5%+(X-100-2000)*5%=25过程

x-2x+3x-4x+5x.+99x-100x=25求解 2x+3x+4x+5x+x+6x+7x=100 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x) 1x+2x+3x+4x+5x+6x+7x…+99x=100 x+2x+3x+.+100x 先化简再求值(x+3x+5x+7x+.+101x)-(2x+4x+6x+...100x),其中x=51分之2 (x-5)(x-2) (x-5)(x+2) 已知x*x-5x-2000=0,求((x-2)(x-2)(x-2)-(x-1)(x-1)+1)/x-2的值 通分x+4/x*x+4x与x-5/x(x-5)-2(x-5) x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 (x+3x+5x...+2009x)-(2x+4x+6x+...+2010x) (x+1)X百分之三十+（100-X）X百分之二十五=2/5X x(x-1)(x-2)...(x-99)(x-100) x/x-3-5x/x^2-x-6计算 x^5-x^4+x^3-x^2+x-1